Couple of rules to get as long a life as possible:1. Check the water regularly. On-board chargers can boil water off as easily as others. I quit using em, but if I were still doing so, I would plug em in and let them charge for a day, then unplug them so that a flakey charger would not smoke the batteries.2. charge immediately after you return home from using them. The longer they sit in a partially discharged state, the more capacity they lose (permanently, I might add).3. An occasional heavy-duty charge for a few hours can also help restore lost capacity. Say 30ah charging rather than 5-10 or trickling.4. Dont forget em during the off-season if it is too cold to fish. Charge at least once a month, once every 2 weeks is better. I typically get what others report. 2 years of decent performance, and perhaps a third if I am lucky. I have not tried the spiral cell batteries but the gel-cell batteries are not bad at all if you dont repeatedly over-charge them.I also have much better luck with brand names like Delco or Interstate. I avoid the never-starts and such as they have never lasted very long. My last new boat (92) came with Stingers and they were also pretty short-lived…2008 Pantera Classic2014 Mercury Pro XS 200
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